Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add f-labs-io/agent-html-skills/plugin install html-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-testing-checklist)<a href="https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-testing-checklist"><img src="https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-testing-checklist/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-testing-checklist"><img src="https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-testing-checklist.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00119 | $0.05027 |
| Opus 5.5 | $0.00048 | $0.02011 |
| Sonnet 5.5 | $0.00024 | $0.01005 |
| Haiku 4.5 | $0.00012 | $0.00503 |
Grade A, and why
html-testing-checklist scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- **Exact inputs** — collect the real commands, URLs, sample payloads, test accounts, and expected outputs while you read. These become the embedded snippets; a step that says "call the endpoint" is a chore, a step with How it starts
The opening of the file, as written. The whole thing — 204 lines — stays where its author put it; the contents beside it link to each section on GitHub.
HTML Testing Checklist
"Please verify this works" usually arrives as a vague worry and leaves as a vague "looks fine". This skill turns it into an artifact: a thorough, walkable test plan — organized into the end-to-end flows a tester actually performs, each step carrying the exact command to run or input to type, what passing looks like, and a tick that advances a real progress bar. When the tester finishes (or gives up for the day), one Submit sends every step's pass/fail/blocked state and notes back to you, so failures become your next work queue instead of a Slack paragraph.
Pre-flight — run BEFORE writing the artifact
Invoke html-skills:html-skills-listen (Skill tool) first; it is idempotent. If it returns a URL, inject it verbatim as window.__CLAUDE_SUBMIT_URL__ in the HTML you are about to write, ?t= query string included (a local, single-session loopback handshake — not a credential). If it reported web/sandbox mode, leave that line out; submitToClaude then falls back to clipboard mode.
When to use this skill
- "Help me test / QA / verify this change (feature, PR, release, migration, bug-fix batch)"
- "What should I check before shipping?"
- "Write me a test plan / verification checklist / regression checklist"
- "I fixed these N bugs — how do I confirm they're all really fixed?"
- Handing work to a tester, reviewer, or teammate who needs to verify results without reverse-engineering the diff
If the user wants to edit or triage data rather than verify software, use html-throwaway-editor. If they want automated tests written, write tests — this skill is for the human verification pass that automated tests don't cover.
Tracker-backed checklists — bug lists are a natural input
A QA queue in an issue tracker is this skill at its best: "test the bugs marked check-QA on the board" should become a smart, two-way HTML checklist rendered from the tracker's real items, not a markdown dump of titles. The round trip runs through the same html-skills-listen receiver as everything else — the page never touches the tracker's API; you hold the credentials and do the writes.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago Changed · +1 lines 102817bab78c
- 2mo ago Changed · +13 lines · -92 tokens per session 8d7293e362c4
- 2mo ago First seen · 190 lines · 211 tokens per session scan A 23b65e342f1d
html-testing-checklist is a skill published in the GitHub repository f-labs-io/agent-html-skills (68 stars, last pushed 1mo ago), licensed MIT. It adds 119 tokens to every session and 5,027 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
html-testing-checklist compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| html-testing-checklistf-labs-io/agent-html-skills | Skill | 68 | 1mo ago | MIT | A | 119 | Claude Code |
| verify-omnigentomnigent-ai/omnigent | Skill | 11k | yesterday | Apache-2.0 | A | 100 | Claude Code, Codex |
| test-masterJeffallan/claude-skills | Skill | 12k | 7d ago | MIT | A | 104 | Claude Code |
| eval-dataset-designbojieli/ai-agent-book | Skill | 57k | 29d ago | Apache-2.0 | A | 138 | Claude Code, Codex |
| dogfoodcallstack/agent-device | Skill | 5.3k | yesterday | MIT | A | 55 | Claude Code |
| cua-driverdavidondrej/skills | Skill | 4.3k | 3d ago | MIT | A | 68 | Claude Code, Codex |
| test-warp-uiwarpdotdev/warp | Skill | 66k | yesterday | AGPL-3.0 | A | 55 | Claude Code |